package collection;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;

public class CollectionDemo2 {
    public static void main(String[] args) {
        //Collection c = new HashSet();
        Collection c = new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(9,0));
        boolean b = c.add(new Point(1,2));
        System.out.println(b);//对于HashSet集而言为false,因为是否重复取决于元素的equals()结果
                              //对于ArrayList集而言为true,因为ArrayList是可重复集

        System.out.println(c);//[(1,2),(3,4)(5,6),(7,8,),(9,0)]
        /*
        boolean contains(object o):
        判断当前集合是否包含给定元素o,若包含则返回true,否者返回false
         */
        Point p = new Point(1,2);
        boolean contains = c.contains(p);
        System.out.println("是否包含:"+contains);

        boolean remove = c.remove(p);
        System.out.println("是否删除:"+remove);
        System.out.println(c);

    }
}
